Adding optical input and supwoffer for AMP

As I waiting for my AMP4 Pro and use it with RPI4. i've got some ideas. My plan is to replace "Harman Kardon Adapt + Amp" what i used with Roon through an external connected Chromecast Audio (as internal becomes obsolete) and ocassionally direct Chromecast. 

1.) It is possible to add optical input for external Chromecast Audio?

(i think yes)

2.) It is possible to add analog subwoffer out?

3.) HIFIBERRY DAC+ DSP alone is good option for this?

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